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PObeginners program designed using threads and classes
 

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  1. PObeginners program designed using threads and classes
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    <p>It seems that this question is too long for anyone to comment on... I'm trying to print out some text and a progress bar in a module called 'laulau.py'. Here's a test piece of code that shows a simple version. My goal is to have only <em>one</em> thread, and send information to it. My question is <strong><em>what is the best way to do this ?</em></strong> </p> <p>file1 (test.py)</p> <pre><code>#!/usr/bin/env python from laulau import laulau import time print "FIRST WAY" total=107 t=laulau() t.echo('this is text') t.setbartotal(total) for a in range(1,total): t.updatebar(a) time.sleep(0.01) time.sleep(1) print print "\ndone loop\n" t.stop() time.sleep(1) print "SECOND WAY" with laulau().echo("this is text"): time.sleep(1) print "\nyes this is working\n" time.sleep(2) </code></pre> <p>file2: laulau.py</p> <pre><code>#!/usr/bin/env python # vim:fileencoding=utf8 from __future__ import division import time import string import threading from sys import stdout class laulau(threading.Thread): def __init__(self, arg=None): super(laulau,self).__init__() self._stop = False self.block='█' self.empty='□' self.TEMPLATE = ('%(progress)s%(empty)s %(percent)3s%%') self.progress = None self.percent = 0 self.bar_width=30 self.bartotal=None def run (self): # start thread for text while not self._stop: if self.bartotal is None: print self.arg, stdout.flush() time.sleep(0.3) else: self.progress = int((self.bar_width * self.percent) / 100) self.data = self.TEMPLATE % { 'percent': self.percent, 'progress': self.block * self.progress, 'empty': self.empty * (self.bar_width - self.progress), } stdout.write('\033[%dG'%1 + self.data + self.arg) stdout.flush() time.sleep(0.1) def setbartotal(self,total): # set progress bar total if self.bartotal is None: self.bartotal = total self.updatebar(0) def updatebar (self,num): self.num=num self.percent = self.percentage(self.num) def percentage (self,numagain): return int((numagain/self.bartotal)*100+1) def echo (self,arg="Default"): #self.thread_debug() self.arg=arg self._stop = False self.start() return self def thread_debug(self): print "threading enumerate :%s"%threading.enumerate() print "current thread :%s"%threading.currentThread() print "thread count (including main thread):%s"%threading.activeCount() def stop(self): self._stop = True def stopped(self): return self._stop == True def __enter__(self): print "\nwe have come through the enter function\n" return self def __exit__(self, type, value, traceback): self._stop = True print "\nwe have exited through the exit function\n" return isinstance(value, TypeError) </code></pre> <p>In some cases the second way could work. e.g., when I am printing some text, and just need the thread to die at the end of it, but not in the case of a progress bar when it needs updates sending to it. While this all sort of works, and I learned a lot, I still can't figure out how to encapsulate this class in the way I want. As I only want one thread I don't really need to keep instantiating the class, I just need to do this once.</p> <p>so e.g. my ideal way would be having three functions only:</p> <ul> <li>1 to control text, turn on progress bar etc (from within one parsed string)</li> <li>2 to set the progress bar total</li> <li>3 to set the progress bar iteration</li> </ul> <p>I need to change two variables in the class (for the progress bar)</p> <ul> <li>one for the total</li> <li>one for the iteration</li> </ul> <p>...and it works out percentage from that.</p> <p>First I thought I should start the thread by inheriting the class stuff from threading, then after looking at <code>threading.Thread(target=blah,etc)</code> at first I couldn't see how to use more than one function, then I discovered I could just put the class name in there <code>threading.Thread(target=laulau)</code> and that would start a thread with the class in, but then I was stumped on how to send that thread information seeing as I hadn't assigned it to a 'name' as in <code>t=laulau()</code></p> <p>My second thought was to have functions outside of the class in my module, but because I need more than one function I got a bit confused there too by adding this to the beginning of laulau.py:</p> <pre><code>def eko (arg): t=laulau() t.echo(arg) def barupate(iteration): t.updatebar(a) def bartotal(): t.setbartotal(a) </code></pre> <p>the first function made an instance of the class but the preceding functions could not change any variables within that. and <em>then</em> i came across function attributes such as <a href="https://stackoverflow.com/questions/338101/python-function-attributes-uses-and-abuses">this</a>. </p> <pre><code>class Foo: @webmethod def bar(self, arg1, arg2): ... def webmethod(func): func.is_webmethod = True return func </code></pre> <p>I then started thinking maybe I could use this somehow but have never come across it before. </p> <p>Ideally id like something like this:</p> <pre><code>echo.total(107) echo('[progressbar] this is text') # starts progress bar and instance of thread if not already there... for a in range(1,total): echo.updatebar(a) time.sleep(0.01) time.sleep(1) echo.stop() # bar would stop at the end of iterations but text animations (blinking etc) may still be going at this point... print print "\ndone loop\n" </code></pre> <p>if you know about python you are probably looking at me funny now, but bear in mind that I'm a total beginner non-professional and am learning every day, a lot of it thanks to this site. cheers for any help!</p> <p>edit: should add that I'm aware of the progress bar module and various other recipes, but I'm making this for learning and fun purposes :)</p>
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    1. CODo you really need to implement your own progress bar module? In any case, it's worth looking at [`python-progressbar`](http://code.google.com/p/python-progressbar/).
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    2. COyeah seen that, have to pick it apart a bit... they cant spell 'tipically' :) its not just a progress bar module, it also prints text. i like the way they call it there `pbar =ProgressBar(widgets=widgets) for i in pbar((i for i in range(24))):`
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    3. COYou're right, this is too long :) but that said, I don't understand why you're using threading to update and display a progress bar?
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